In a dual compressor engine, what is the speed (RPM or percent) of the low pressure compressor referred to as?

In a dual compressor engine, the designation for the speed of the low pressure compressor is referred to as N1. N1 is a crucial parameter that reflects the operational speed of the low pressure compressor, which plays a key role in the overall performance and efficiency of the engine.

The low pressure compressor is responsible for moving air through the engine and generating the necessary pressure for combustion. Understanding N1 is essential as it influences thrust, fuel efficiency, and engine operation during different phases of flight. It is measured in terms of RPM or as a percentage of the maximum designed speed.

The other terms, such as N2, refer to the high pressure compressor speed. P1 and P2 typically relate to pressure measurements rather than rotational speed; therefore, they are not relevant in this context. Recognizing the distinctions among these terms helps clarify their specific functions and measurements in engine operation.